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Definition of black cockatoo in US English:

black cockatoo

noun

Any of several large, predominantly black, Australian cockatoos constituting the genus Calyptorhynchus (family Cacatuidae), formerly regarded as subspecies of C. funereus; also (more fully "great black cockatoo") the palm cockatoo, Probosciger aterrimus, of the same family.

Origin

Mid 18th century; earliest use found in George Edwards (1694–1773), ornithologist and artist.